AO integrated sewage treatment plant

Abstract

The utility model discloses an A3O integrated sewage treatment plant which comprises a biochemical treatment tank and a comprehensive sedimentation tank, one end of the biochemical treatment tank is communicated with a sewage inlet pipe, and the comprehensive sedimentation tank is positioned in the middle of the biochemical treatment tank; the biochemical treatment tank and the sedimentation tank are arranged in a bilateral symmetry manner; at least two anaerobic zones of the biochemical treatment tank are arranged below the comprehensive sedimentation tank, a shunt sedimentation tank is arranged between the biochemical treatment tank and the comprehensive sedimentation tank, and sewage in the shunt sedimentation tank flows to the biochemical treatment tank and the comprehensive sedimentation tank respectively. According to the A3O integrated sewage treatment plant provided by the utility model, all sewage treatment facilities are integrated, and the anaerobic zone is positioned below the comprehensive sedimentation tank, so that the space utilization rate is high, the occupied area is reduced, and the capital construction investment cost is also reduced; meanwhile, the sludge concentration of the sewage treatment system is improved, the treatment capacity of the treatment system is improved, and the treatment effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an A 3 O-integrated wastewater treatment plant. Background Technology

[0002] Biological wastewater treatment is currently the most common and widely used method in the field of wastewater treatment. Although its processes vary, it basically consists of anaerobic tanks, anoxic tanks, aerobic zones, sedimentation tanks, and other facilities with special requirements. The various facilities in a wastewater treatment system are usually arranged according to the flow direction of the process, and each treatment facility is mostly independently installed, requiring a large land area and long pipelines. In today's increasingly land-scarce environment, this involves significant land acquisition costs and the difficult task of coordinating various conflicts arising from land acquisition, especially in newly built or expanded wastewater treatment facilities where the land occupation issue is particularly prominent. Because each treatment facility is independently installed, not only are long connecting pipelines required, but the water level difference between treatment facilities also increases, raising the operating costs of the wastewater treatment plant.

[0003] To address the issue of large land area required for wastewater treatment facilities, membrane bioreactors (MBRs) have recently seen widespread application in the wastewater treatment field. This technology replaces the gravity sedimentation separation process in traditional activated sludge treatment with ultrafiltration and microfiltration membrane separation, saving a significant amount of land area required for gravity separation. However, its high energy consumption, high equipment price, and stringent control requirements severely limit its widespread adoption.

[0004] Ensuring that each wastewater treatment facility meets the required treatment objectives while also being compact, cost-effective, and easy to manage is a pressing challenge in current wastewater treatment engineering. How to rationally utilize the characteristics of each facility in the wastewater treatment process, fully leverage their normal functions, and optimize their layout to achieve a small footprint, low investment cost, and low operating expense is currently a top priority in the wastewater treatment field. Utility Model Content

[0005] In view of this, the present invention proposes a method A 3 O-integrated wastewater treatment plant.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A 3 An integrated wastewater treatment plant includes:

[0008] A biological treatment tank, one end of which is connected to a sewage inlet pipe.

[0009] A comprehensive sedimentation tank, located in the middle of the biological treatment tank;

[0010] Below the integrated sedimentation tank is an anaerobic zone of a biological treatment tank, and the number of the anaerobic zones is at least two.

[0011] A diversion sedimentation tank is provided between the biochemical treatment tank and the integrated sedimentation tank, and the wastewater in the diversion sedimentation tank flows to the biochemical treatment tank and the integrated sedimentation tank respectively.

[0012] The biochemical treatment tank, the integrated sedimentation tank, and the diversion sedimentation tank are all arranged symmetrically on the left and right.

[0013] As a further improvement to the above technical solution:

[0014] An optimized version of the above technical solution is that a sludge trough is formed between two adjacent anaerobic zones, a sludge discharge device is provided above the integrated sedimentation tank, a sludge suction pipe is provided below the sludge discharge device, and the other end of the sludge suction pipe is located inside the sludge trough.

[0015] An optimized version of the above technical solution is as follows: the integrated sedimentation tank includes an inlet, a clarification zone, an inclined tube sedimentation zone, an intermediate sedimentation zone, a clear water zone, and an outlet trough. The inlet is located below both sides of the integrated sedimentation tank. Both ends of the inlet are connected to the diversion sedimentation tank and the clarification zone, respectively. The upper part of the clarification zone is connected to the inclined tube sedimentation zone, and one side is connected to the intermediate sedimentation zone. The intermediate sedimentation zone and the inclined tube sedimentation zone are both connected to the clear water zone. An outlet trough is provided above the clear water zone, and the clear water is discharged to the outside through the outlet trough.

[0016] An optimized version of the above technical solution is as follows: the biochemical treatment tank includes a primary anoxic zone, an anaerobic zone, a secondary anoxic zone, and an aerobic zone. Multiple anaerobic zones are located below the integrated sedimentation tank. Both ends of each anaerobic zone are connected to the primary anoxic zone and the secondary anoxic zone, respectively. The upper part of the primary anoxic zone is connected to the sewage inlet pipe. The left and right ends of the primary anoxic zone are connected to the left and right diversion sedimentation tanks, respectively. Both ends of the secondary anoxic zone are connected to the left and right aerobic zones, respectively. The aerobic zone is connected to the diversion sedimentation tanks, which are symmetrically located on both sides of the integrated sedimentation tank.

[0017] An optimized version of the above technical solution is that the lower part of each primary anoxic zone is connected to the anaerobic zone via a reflux pump.

[0018] An optimized version of the above technical solution is that part of the anaerobic zone is connected to the primary anoxic zone via a reflux pump, and the other part of the anaerobic zone is connected to the secondary anoxic zone via a reflux pump.

[0019] An optimized version of the above technical solution is that the cross-section of the anaerobic zone has a triangular shape at the top and a rectangular shape at the bottom.

[0020] An optimized version of the above technical solution is that an air agitator is installed at the bottom of both the primary and secondary anoxic zones.

[0021] An optimized version of the above technical solution is that an aerator is provided at the bottom of the aerobic zone.

[0022] An optimized version of the above technical solution is that there are multiple aerobic zones, and the connecting roads between the multiple aerobic zones are distributed in a Z-shape.

[0023] An optimized solution to the above technical solution is that a sludge discharge pump is installed below the diversion sedimentation tank.

[0024] Compared with existing technologies, the beneficial effects of this utility model are:

[0025] 1. The A provided by this utility model 3 The integrated wastewater treatment plant combines various wastewater treatment facilities into one unit. The anaerobic zone is located below the sedimentation tank, which maximizes space utilization, reduces the footprint, and lowers infrastructure investment costs. At the same time, it increases the sludge concentration of the wastewater treatment system, enhances the treatment capacity, and improves the treatment effect. There are no connecting pipes between the various wastewater treatment facilities, resulting in low water flow resistance, which reduces equipment investment costs and lowers operating expenses.

[0026] 2. The A provided by this utility model 3 The integrated wastewater treatment plant arranges each wastewater treatment facility symmetrically along its left and right axes, resulting in a compact layout that reduces the footprint. It also features fewer operating devices, facilitating maintenance and management. With primary reflux and mixing, and a large reflux ratio, it is ideal for denitrification of high ammonia nitrogen wastewater.

[0027] 3. The A provided by this utility model 3 In an integrated wastewater treatment plant, sludge flows from the inclined tube sedimentation zone to the clarification zone. Excess sludge in the clarification zone enters the sludge hopper or the diversion sedimentation tank, which is completed automatically by gravity, saving both equipment investment and power costs. Part of the wastewater in the diversion sedimentation tank is returned to the primary anoxic tank, creating a closed-loop flow of wastewater from the primary anoxic zone to the anaerobic zone, from the anaerobic zone to the secondary anoxic zone, from the secondary anoxic zone to the aerobic zone, from the aerobic zone to the diversion sedimentation tank, and from the diversion sedimentation tank to the primary anoxic zone, thus saving operating costs. Attached Figure Description

[0028] Figure 1 This is a side sectional view of the present invention.

[0029] Figure 2This is a top view of the structure of this utility model.

[0030] Figure 3 This is a schematic diagram of the bottom cross-sectional structure of this utility model;

[0031] Figure 4 This is a schematic diagram of the bottom cross-sectional structure of this utility model.

[0032] In the diagram: 1. Primary anoxic zone; 2. Anaerobic zone; 3. Secondary anoxic zone; 4. Aerobic zone; 5. Return pump; 6. Air mixer; 7. Aerator; 8. Diversion sedimentation tank; 9. Sludge pump; 10. Water outlet; 11. Clarification zone; 12. Inclined tube sedimentation zone; 13. Intermediate sedimentation zone; 14. Clear water zone; 15. Effluent trough; 16. Sludge trough; 17. Sludge discharge device; 18. Sludge suction pipe. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figures 1 to 3 As shown, the main technical solution of this embodiment includes: a comprehensive sedimentation tank in the middle, a surrounding biochemical treatment tank, and a diversion sedimentation tank 8 for connecting the comprehensive sedimentation tank and the biochemical treatment tank. The sewage treatment facilities are arranged horizontally and are arranged symmetrically along the left and right axes.

[0037] The biological treatment tank includes a primary anoxic zone 1, an anaerobic zone 2, a secondary anoxic zone 3, and an aerobic zone 4. Multiple anaerobic zones 2 are located below the integrated sedimentation tank. Both ends of multiple anaerobic zones 2 are connected to the primary anoxic zone 1 and the secondary anoxic zone 3, respectively. The upper part of the primary anoxic zone 1 is connected to the sewage inlet pipe. The left and right ends of the primary anoxic zone 1 are connected to the left and right diversion sedimentation tanks 8, respectively. The two ends of the secondary anoxic zone 3 are connected to the left and right aerobic zones 4, respectively. The aerobic zones 4 are connected to the diversion sedimentation tanks 8, which are symmetrically located on both sides of the integrated sedimentation tank.

[0038] At the same time, by the appendix Figure 1 It can be seen that the aerobic zone 4 is composed of multiple areas connected in a Z-shape, which are connected to the secondary anoxic zone 3 and the diversion sedimentation tank 8 respectively. The design of the aerobic zone 4 can increase or decrease the number of areas to adapt to different water quality and discharge requirements. Several aerators 7 are installed at the bottom of the aerobic zone 4.

[0039] Several air agitators 6 are installed at the bottom of the primary anoxic zone 1 and the secondary anoxic zone 3. By adjusting the air agitators 6 to increase or decrease the dissolved oxygen concentration in the primary anoxic zone 1 or the secondary anoxic zone 3, the primary anoxic zone 1 or the secondary anoxic zone 3 can be transformed into an aerobic zone 4 or an anaerobic zone 2 to meet the needs of different treatment conditions.

[0040] A return pump 5 is installed at the bottom of each anoxic zone. The return pump 5 returns the sewage from the primary anoxic zone 1 to the anaerobic zone 2. The sewage flow direction of all anaerobic zones 2 can be from the primary anoxic zone 1 to the secondary anoxic zone 3, or a part of the sewage flow direction of anaerobic zones 2 can be from the primary anoxic zone 1 to the secondary anoxic zone 3, and another part of the sewage flow direction of anaerobic zones 2 can be from the secondary anoxic zone 3 to the primary anoxic zone 1.

[0041] Due to differences in density, sludge in wastewater settles at different rates; lower density results in slower sedimentation, while higher density leads to faster sedimentation. The diversion sedimentation tank 8 separates the wastewater into two parts: upper return wastewater with lower sludge density and lower settling wastewater with higher sludge density. The upper return wastewater with lower sludge density flows back to the primary anoxic zone 1, while the lower settling wastewater with higher sludge density enters the clarification zone 11 through the inlet 10. The volume of settling wastewater is equal to the influent volume, and the return wastewater volume is adjusted by the size of the return pump 5 to meet different needs.

[0042] From the appendix Figure 1It can be seen that the integrated sedimentation tank is separated from the biological treatment tank by the diversion sedimentation tank 8. However, there are water outlets 10 (symmetrical) on the left and right sides below the integrated sedimentation tank. The part connected to the water outlets 10 in the integrated sedimentation tank is the clarification zone 11. Above the clarification zone 11, there are inclined tube sedimentation zone 12 and clear water zone 14 connected in sequence. The position between the two clarification zones 11 is the intermediate sedimentation zone 13. Above the intermediate sedimentation zone 13 is the clear water zone 14. There are water outlet troughs 15 above the clear water zone 14 for discharging clear water.

[0043] Since the sludge in the intermediate sedimentation zone 13 will sink into the space between the two adjacent anaerobic zones 2, forming a sludge trough 16, a sludge discharge device 17 is installed above the integrated sedimentation tank, and a sludge suction pipe 18 is installed below the sludge discharge device 17. The other end of the sludge suction pipe 18 is located in the sludge trough 16, thereby discharging the sludge that has sunk into the sludge trough 16. At the same time, the sludge in the inclined tube sedimentation zone 12 sinks into the clarification zone 11. Part of the sludge in the clarification zone 11 will sink into the sludge trough 16 and be discharged through the sludge discharge device 17, while the other part will sink into the diversion sedimentation tank 8 through the water outlet 10. Therefore, a sludge discharge pump 9 is installed below the diversion sedimentation tank 8 to assist in sludge discharge.

[0044] At the same time, by the appendix Figure 1 As can be seen from the diagram, the cross-section of anaerobic zone 2 has a triangular shape at the top and a rectangular shape at the bottom, which allows sludge to slide along the inclined side into sludge tank 16 or diversion sedimentation tank 8. At the same time, the number of anaerobic zones 2 can be increased or decreased appropriately according to the size of the site.

[0045] Therefore, the entire wastewater treatment process is as follows: wastewater enters the primary anoxic zone 1 through the wastewater inlet pipe. The wastewater in the primary anoxic zone 1 enters the corresponding anaerobic zone 2 through the return pump 5 at the bottom of each anaerobic zone 2. Then, the wastewater in the anaerobic zone 2 flows into the secondary anoxic zone 3. The wastewater in the secondary anoxic zone 3 flows to both sides and enters the aerobic zone 4. The wastewater in the aerobic zone 4 flows into the diversion sedimentation tank 8. Part of the wastewater in the diversion sedimentation tank flows back to the primary anoxic zone 1 (where the sludge density is low) for recirculation, while the other part of the wastewater enters the comprehensive sedimentation tank (where the sludge density is high) through the outlet 10.

[0046] Wastewater passing through inlet 10 enters clarification zone 11. Part of it passes through inclined tube sedimentation zone 12 and clear water zone 14, and is discharged to the outside through outlet trough 15. Another part passes through intermediate sedimentation zone 13 and clear water zone 14, and is discharged to the outside through outlet trough 15.

[0047] From the appendix Figure 1It can be seen that the sludge in the intermediate sedimentation tank 13 settles into the sludge trough 16, the sludge in the inclined tube sedimentation zone 12 settles into the clarification zone 11, and part of the remaining sludge in the clarification zone 11 settles into the sludge trough 16, while the other part enters the diversion sedimentation tank 8 through the water outlet 10; the sludge discharge device 17 on the integrated sedimentation tank and the sludge discharge pump 9 in the diversion sedimentation tank 8 discharge sludge to the outside.

[0048] From the appendix Figure 3 It can be seen that all water flow directions are from the primary anoxic zone 1 into the anaerobic zone 2 via the return pump 5. However, to meet the needs of different situations, it can also be set as shown in the attached diagram. Figure 4 As shown, some of the return pumps 5 in anaerobic zone 2 are located on one side of the primary anoxic zone 1, directing wastewater from the primary anoxic zone 1 into anaerobic zone 2, and then into the secondary anoxic zone 3. Other return pumps 5 in anaerobic zone 2 are located on one side of the secondary anoxic zone 3, transporting wastewater from the secondary anoxic zone 3 back to anaerobic zone 2 and then back to the primary anoxic zone. This increases the number of wastewater circulation cycles, achieving better purification results. Simultaneously, the attached... Figure 4 As can be seen from this, the number of return pumps 5 on the side of the secondary anoxic zone 3 should be less than the number of return pumps 5 on the side of the primary anoxic zone 1, in order to avoid a small amount of sewage being transported to the aerobic zone 4, resulting in low sewage treatment efficiency.

[0049] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An A 3 An integrated wastewater treatment plant characterized by, include: A biological treatment tank, one end of which is connected to a sewage inlet pipe. A comprehensive sedimentation tank, located in the middle of the biological treatment tank; The anaerobic zone (2) of the biochemical treatment tank is set below the integrated sedimentation tank, and the number of the anaerobic zones (2) is at least 2; A diversion sedimentation tank is provided between the biochemical treatment tank and the integrated sedimentation tank, and the wastewater in the diversion sedimentation tank flows to the biochemical treatment tank and the integrated sedimentation tank respectively. The biochemical treatment tank, the integrated sedimentation tank, and the diversion sedimentation tank (8) are all arranged symmetrically on the left and right.

2. The A of claim 1 3 An integrated sewage treatment plant characterized by The two adjacent anaerobic zones (2) form a sludge trough (16). A sludge discharge device (17) is provided above the integrated sedimentation tank, and a sludge suction pipe (18) is provided below the sludge discharge device (17). The other end of the sludge suction pipe (18) is located inside the sludge trough (16).

3. The A of claim 1 3 An integrated sewage treatment plant characterized by The integrated sedimentation tank includes an inlet (10), a clarification zone (11), an inclined tube sedimentation zone (12), an intermediate sedimentation zone (13), a clear water zone (14), and an outlet trough (15). The inlet (10) is located below both sides of the integrated sedimentation tank. The two ends of the inlet (10) are connected to the diversion sedimentation tank (8) and the clarification zone (11) respectively. The upper part of the clarification zone (11) is connected to the inclined tube sedimentation zone (12), and one side is connected to the intermediate sedimentation zone (13). The upper part of the intermediate sedimentation zone (13) and the inclined tube sedimentation zone (12) are both connected to the clear water zone (14). An outlet trough (15) is provided above the clear water zone (14), and the clear water is discharged to the outside through the outlet trough (15).

4. The A of claim 1 3 An integrated sewage treatment plant characterized by The biochemical treatment tank includes a primary anoxic zone (1), an anaerobic zone (2), a secondary anoxic zone (3), and an aerobic zone (4). Multiple anaerobic zones (2) are located below the integrated sedimentation tank. Both ends of multiple anaerobic zones (2) are connected to the primary anoxic zone (1) and the secondary anoxic zone (3), respectively. The upper part of the primary anoxic zone (1) is connected to the sewage inlet pipe. The left and right ends of the primary anoxic zone (1) are connected to the diversion sedimentation tanks (8) on the left and right sides, respectively. Both ends of the secondary anoxic zone (3) are connected to the aerobic zones (4) on the left and right sides, respectively. The aerobic zone (4) is connected to the diversion sedimentation tanks (8). The diversion sedimentation tanks (8) are symmetrically located on both sides of the integrated sedimentation tank.

5. The A of claim 4 3 An integrated sewage treatment plant characterized by Each of the primary anoxic zones (1) is connected to the anaerobic zone (2) via a reflux pump (5).

6. The A of claim 4 3 An integrated sewage treatment plant characterized by One part of the anaerobic zone (2) is connected to the primary anoxic zone (1) via a reflux pump (5), and the other part of the anaerobic zone (2) is connected to the secondary anoxic zone (3) via a reflux pump (5).

7. The A of claim 1, 2, or 4 3 An integrated sewage treatment plant characterized by The cross-section of the anaerobic zone (2) is triangular at the top and rectangular at the bottom.

8. The A of claim 4 3 An integrated sewage treatment plant characterized by An air agitator (6) is installed at the bottom of both the primary hypoxia zone (1) and the secondary hypoxia zone (3).

9. The A of claim 4 3 An integrated sewage treatment plant characterized by An aerator (7) is provided at the bottom of the aerobic zone (4). There are multiple aerobic zones (4), and the connecting roads between the multiple aerobic zones (4) are distributed in a Z-shape.

10. The A of claim 1 3 An integrated sewage treatment plant characterized by A sludge pump (9) is installed below the diversion sedimentation tank (8).

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